Textile and Apparel Industries

Effect of Yarn Delivery and Couliering Depth on Yarn Input Tension and Fabric Defects for Positive-Feed Based Circular Knitting Machines

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Abstract

The optimized settings of quality adjustment pulley (QAP) and couliering are highly desirable to obtain precise stitch length (SL) values on acceptable state of fabric. The study was aimed to explore the type and number of knit fabric defects occurred due to different yarn input tensions (YIT)adjusted through machine setting. A single jersey fabric was knitted in a circular knitting machine with positive storage feeding system. The yarn delivery rate was maintained by different QAP disk diameter with four central couliering settings. The YIT, SL, and 4-point fabric inspection (ASTM 5430-07) were determined using an MLT WESCO yarn meter, aHATRA course length tester (BS 5441:1988), and a fabric inspection machine respectively. Bivariate regression analysis between QAP disk diameter vs. YIT and YIT vs. SL were conducted as well as the relationship among YIT, fabric defect types and the defects points per 100 m2 fabric was observed. YIT was altered in three different ways, and this resulted four types of fabric defects-drop stitch, hole, run, and press-off. Among these defects, drop stitches and holes were more prominent.

Keywords: Stitch length, knit, yarn tension, couliering, Yarn tension, Couliering

How to Cite:

Hossain, A., Islam, M. & Patwary, S. U., (2020) “Effect of Yarn Delivery and Couliering Depth on Yarn Input Tension and Fabric Defects for Positive-Feed Based Circular Knitting Machines”, International Textile and Apparel Association Annual Conference Proceedings 77(1). doi: https://doi.org/10.31274/itaa.13047